![]() ![]() If infected potato tubers are planted, late blight will likely be present on the emerging plants. Sources of infection include infected seed potatoes, infected tomato seedlings and spores blowing in from adjacent diseased gardens, fields or cull piles. Late Blight Disease Development Photo 3: Courtesy of Department Infected potatoes and tomatoes rot quickly, either on the plant or once in storage. Lesions can also develop on tomato fruit, usually as a bronze or coppery-coloured lesion at the shoulder of the fruit (Photo 5). Infected potato tubers develop a reddish-brown discolouration just beneath the skin (Photo 4). A strong decay odour often accompanies widespread infection. Stems of infected plants weaken and droop, giving a characteristic flagging appearance to the canopy. Early in the morning or on wet days, a white cottony growth may form on the underside of infected leaves (Photo 3). In dry weather, late blight lesions stop growing and turn dark brown and brittle. Infected stems and petioles will turn dark brown or black (Photo 2). The lesions run across the veins, as opposed to the disease "early blight" where the lesions are typically confined by the leaf veins. On potato and tomato leaves, late blight symptoms first appear as water-soaked lesions surrounded by a pale green halo (Photo 1). Late blight typically affects only potatoes and tomatoes in Saskatchewan, but peppers, eggplant and petunias are also susceptible. Reduce late blight by planting disease-free stock and diligently monitoring for symptoms. However, the cool and rainy conditions encountered across the province in 20 were ideal for late blight, reminding us that wet conditions can lead to substantial loss from blight. In Saskatchewan, the typically warm and dry summers limit disease development and late blight is not a common problem. Late blight is the single most damaging disease of potato. If you have any questions about Google™ Translate, please visit: Google™ Translate FAQs.Ĭontrolling Late Blight in Potato and Tomato Gardens Photo 1: Courtesy of Alberta Government of Saskatchewan is not responsible for any damage or issues that may possibly result from using translated website content. Some files or items cannot be translated, including graphs, photos and other file formats such as portable document formats (PDFs).Īny person or entities that rely on information obtained from the system does so at his or her own risk. The Government of Saskatchewan does not warrant the accuracy, reliability or timeliness of any information translated by this system. The translation should not be considered exact, and may include incorrect or offensive language. Software-based translations do not approach the fluency of a native speaker or possess the skill of a professional translator. Translations are made available to increase access to Government of Saskatchewan content for populations whose first language is not English. Google™ Translate is a free online language translation service that can translate text and web pages into different languages. Where an official translation is not available, Google™ Translate can be used. The home page for French-language content on this site can be found at: These translations are identified by a yellow box in the right or left rail that resembles the link below. A number of pages on the Government of Saskatchewan's website have been professionally translated in French. ![]()
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